Requirement

Location

Specification

 

 

 

Humidifier drain

Cold aisle side (1)

3.18 cm (1.25 in) drain line and 26.5 lpm (7 gpm) max

Chilled water supply

The following are the water quality requirements and specifications:

•Closed-loop water must not contain any lime scale deposits or loose debris.

•The temperature of the chilled water supplied to the HP POD 20c must be 12ºC to 24ºC (55ºF to 75ºF).

CAUTION: Freezing water can cause a blockage and damage to the unit. In outside locations that are subject to freezing temperatures, an additive such as glycol might be necessary to lower the freezing point. However, since the heat transfer potential of water with glycol is lower, the HP POD 20c must be de-rated accordingly.

IMPORTANT: The chilled water system piping and heat exchangers must be drained completely, and then purged using compressed air when storing or transporting at or below freezing temperatures.

IMPORTANT: Operating the chilled water system at the higher end of the acceptable range decreases the overall thermal capacity of the POD.

Acceptable water quality specifications

Water must be maintained per the following acceptable water quality standards.

Parameter

Range

 

 

pH

8.0–10

Specific conductance at 25ºC (77ºF)

10–2500 µmhos

Alkalinity ("M" as CaCO3)

150–1000 ppm

Sulfur (SO4)

0–150 ppm

Chloride (Cl)

0–100 ppm

Hardness (CaCO3)

0–350 ppm

Calcium hardness (CaCO3)

0–200 ppm

Magnesium hardness (CaCO3)

0–150 ppm

Copper (Cu)

< 0.20 ppm

Iron (Fe)

< 3.0 ppm

Aluminum (Al)

< 0.50 ppm

Sodium (Na)

0–1000 ppm

Silica (SiO2)

0–150 ppm

Zinc (Zn)

< 1.0 ppm

Manganese (Mn)

< 0.1 ppm

Phosphate Ortho- (PO4)

< 3 ppm

Bacteria

< 1000 CFU/ml

Suspended solids

< 10 ppm

If your water is out of range, consult a water quality expert.

The following table describes the chilled water system specifications for the HP POD 20c.

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